Device and method of generating self-interference cancellation signal for full-duplex communication device

Abstract

The disclosure involves a device and a method of generating a self-interference cancellation signal for a full-duplex communication device. The device is configured to: detect a strength value of a self-interference signal; adjust a strength value of a first reference signal to the strength value of the self-interference signal to generate a second reference signal; adjust the second reference signal according to a predetermined adjustment parameter corresponding to each of a circle of phase angle values respectively to generate a plurality of third reference signals; determine a difference between each of the third reference signals and a receiving signal of the full-duplex communication device including the self-interference signal; and determine one of the third reference signals that corresponds to the smallest of the differences as a self-interference cancellation signal for canceling the self-interference signal.

What is claimed is: 
     
         1 . A device of generating a self-interference cancellation signal for a full-duplex communication device, comprising:
 a strength detector, being configured to detect a strength value of a self-interference signal, the self-interference signal being from a transmitting signal of the full-duplex communication device;   a strength adjuster, being configured to adjust a strength value of a first reference signal into the strength value of the self-interference signal to generate a second reference signal;   a phase angle adjuster, being configured to adjust the second reference signal according to a predetermined adjustment parameter corresponding to each of a circle of phase angle values respectively to generate a plurality of third reference signals; and   a signal determiner, being configured to determine a difference between each of the third reference signals and a receiving signal of the full-duplex communication device, and determine one of the third reference signals that corresponds to the smallest of the differences as a self-interference cancellation signal for canceling the self-interference signal, the receiving signal comprising the self-interference signal.   
     
     
         2 . The device of generating a self-interference cancellation signal according to  claim 1 , wherein the first reference signal is coupled from the transmitting signal. 
     
     
         3 . The device of generating a self-interference cancellation signal according to  claim 1 , wherein the phase angle adjuster adjusts the second reference signal according to at least one of a sequence searching method and a binary searching method, and the signal determiner determines the differences according to at least one of the sequence searching method and the binary searching method. 
     
     
         4 . The device of generating a self-interference cancellation signal according to  claim 1 , wherein the phase angle adjuster comprises a multi-path adjustment circuit, the multi-path adjustment circuit comprises multiple paths each of which comprises a delay element and an attenuation/gain element, and the phase angle adjuster determines the circle of phase angle values and the predetermined adjustment parameters by controlling the delay elements and the attenuation/gain elements. 
     
     
         5 . The device of generating a self-interference cancellation signal according to  claim 4 , wherein the phase angle adjuster controls the delay elements and the attenuation/gain elements according to each of the predetermined adjustment parameters respectively to adjust the second reference signal. 
     
     
         6 . The device of generating a self-interference cancellation signal according to  claim 1 , wherein the phase angle adjustor comprises a single-path adjustment circuit, the single-path adjustment circuit comprises a delay element and an attenuation/gain element, and the phase angle adjuster determines the circle of phase angle values and the predetermined adjustment parameters by controlling the single delay element and the single attenuation/gain element. 
     
     
         7 . The device of generating a self-interference cancellation signal according to  claim 6 , wherein the phase angle adjuster controls the delay element and the attenuation/gain element according to each of the predetermined adjustment parameters respectively to adjust the second reference signal. 
     
     
         8 . The device of generating a self-interference cancellation signal according to  claim 1 , wherein:
 the phase angle adjuster is further configured to adjust the first reference signal according to the predetermined adjustment parameter corresponding to each of the circle of phase angle values respectively to generate a plurality of fourth reference signals;   the strength adjuster is further configured to adjust a strength value of each of the fourth reference signals into the strength value of the self-interference signal to generate a plurality of fifth reference signals; and   the signal determiner is further configured to determine a difference between each of the fifth reference signals and the receiving signal, and determine one of the fifth reference signals that corresponds to the smallest of the differences as the self-interference cancellation signal for canceling the self-interference signal.   
     
     
         9 . A method of generating a self-interference cancellation signal for a full-duplex communication device, the method comprising:
 detecting by a strength detector a strength value of a self-interference signal, the self-interference signal being from a transmitting signal of the full-duplex communication device;   adjusting by a strength adjuster a strength value of a first reference signal into the strength value of the self-interference signal to generate a second reference signal;   adjusting by a phase angle adjuster the second reference signal according to a predetermined adjustment parameter corresponding to each of a circle of phase angle values respectively to generate a plurality of third reference signals;   determining by a signal determiner a difference between each of the third reference signals and a receiving signal of the full-duplex communication device, the receiving signal comprising the self-interference signal; and   determining by the signal determiner one of the third reference signals that corresponds to the smallest of the differences as a self-interference cancellation signal for canceling the self-interference signal.   
     
     
         10 . The method of generating a self-interference cancellation signal according to  claim 9 , wherein the first reference signal is coupled from the transmitting signal. 
     
     
         11 . The method of generating a self-interference cancellation signal according to  claim 9 , wherein the phase angle adjuster adjusts the second reference signal according to at least one of a sequence searching method and a binary searching method, and the signal determiner determines the differences according to at least one of the sequence searching method and the binary searching method. 
     
     
         12 . The method of generating a self-interference cancellation signal according to  claim 9 , wherein the phase angle adjuster comprises a multi-path adjustment circuit, the multi-path adjustment circuit comprises multiple paths each of which comprises a delay element and an attenuation/gain element, and the phase angle adjuster determines the circle of phase angle values and the predetermined adjustment parameters by controlling the delay elements and the attenuation/gain elements. 
     
     
         13 . The method of generating a self-interference cancellation signal according to  claim 12 , wherein the phase angle adjuster controls the delay elements and the attenuation/gain elements according to each of the predetermined adjustment parameters respectively to adjust the second reference signal. 
     
     
         14 . The method of generating a self-interference cancellation signal according to  claim 9 , wherein the phase angle adjustor comprises a single-path adjustment circuit, the single-path adjustment circuit comprises a delay element and an attenuation/gain element, and the phase angle adjuster determines the circle of phase angle values and the predetermined adjustment parameters by controlling the single delay element and the single attenuation/gain element. 
     
     
         15 . The method of generating a self-interference cancellation signal according to  claim 14 , wherein the phase angle adjuster controls the delay element and the attenuation/gain element according to each of the predetermined adjustment parameters respectively to adjust the second reference signal. 
     
     
         16 . The method of generating a self-interference cancellation signal according to  claim 9 , further comprising:
 adjusting by the phase angle adjuster the first reference signal according to the predetermined adjustment parameter corresponding to each of the circle of phase angle values respectively to generate a plurality of fourth reference signals;   adjusting by the strength adjuster a strength value of each of the fourth reference signals into the strength value of the self-interference signal to generate a plurality of fifth reference signals; and   determining by the signal determiner a difference between each of the fifth reference signals and the receiving signal, and determining one of the fifth reference signals that corresponds to the smallest of the differences as the self-interference cancellation signal for canceling the self-interference signal.